| ID | Name | Type |
|---|---|---|
| #1219 | Aquarius Edizioni | Z |
| #1220 | Aquarius Software | Z |
| #1221 | ArSoft Corp. | Z |
| #1222 | Aragorn | - |
| #1223 | Arajp | ? |
| #1224 | Aratz Juanes | ? |
| #19162 | Arbitrary Files | Z |
| #1225 | Arc Developments | Z |
| #1226 | Arcade Age | Z |
| #17046 | Arcade Computers | A |
| #17047 | Arcade International Software | S |
| #1227 | Arcade Software | P |
| #17048 | Arcade Systems | M |
| #1228 | Arcadia | ? |
| #1229 | Arcadia S.r.l. | Z |
| #1230 | Arcadia Soft | Z |
| #16005 | Arcadia Software | P |
| #1231 | Arcadia Systems Inc | Z |
| #1232 | Arcana Software Design | Z |
| #1233 | Arcanum Software Developments | Z |